Facebook is tightening restrictions on its live-streaming feature in the wake of the horrific mass shooting in Christchurch, New Zealand, as world leaders prepare to meet for a summit aimed at curbing online terror.

The social media giant said it is introducing a “one-strike” policy, which temporarily restricts access for users that break Facebook rules. The company did not specify which offenses will be covered by the policy or the length of suspensions for rule-breaking users.

“Live can be abused and we want to take steps to limit that abuse,” Facebook said in a statement. The company said they plan to extend the restrictions over the coming weeks, including to the creation of ads, but did not lay out specific plans.

New Zealand’s Prime Jacinda Ardern and French President Emmanuel Macron will host a summit starting Wednesday where they plan to ask tech giants to sign a pledge called the “Christchurch Call” to agree to combat extremism on the internet.

“Facebook’s decision to put limits on live streaming is a good first step to restrict the application being used as a tool for terrorists, and shows the Christchurch Call is being acted on,” Ardern said in an email from her spokesman, according to Reuters.

Facebook also announced a $7.5 million investment into a partnership with three universities – the University of Maryland, Cornell University and the University of California, Berkeley – to research new methods to find edited versions of content.

Several countries have taken steps to regulate online content since the attack. Last month Australia passed legislation setting out fines and punishment for social media sites for hosting hate content, and the U.K. has proposed making social media executives personally responsible for harmful content shared on their platforms.